<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style>
    html,body {
      width: 100%;
      height: 100%;
    }
    .par {
      /* position: absolute;
      top: 0;
      right: 0;
      bottom: 0;
      left: 0; */
      width: 100px;
      height: 100px;
      /* margin: auto; */
      background-color: red;
    }
    .par1 {
      height: 100%;
      display: flex;
      justify-content: center;
      align-items: center;
    }
  </style>
</head>
<body>
  <div>1232</div>
  <script src="output/bundle.js" async></script>
</body>

</html>